文献类型：期刊文献

英文题名：Deep Separation of Benzene from Cyclohexane by Liquid Extraction Using Ionic Liquids as the Solvent

作者：Zhou, Teng[1];Wang, Ziyun[1];Ye, Yinmei[1];Chen, Lifang[1];Xu, Jing[1];Qi, Zhiwen[1]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：51

期号：15

起止页码：5559

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20121714963933);WOS:【SCI-EXPANDED(收录号:WOS:000302882400023)】；

基金：This research is supported by the Shanghai Pujiang Talents Program (10PJ1402400), National Natural Science Foundation of China (NSFC Grants 21076074 and 21006029), Major State Basic Research Development Program of China (973 Program 2012CB720500), Shanghai Natural Science Foundation (10ZR1407200), Program of Introducing Talents of Discipline to Universities (111 Project: B08021), and Fundamental Research Funds for the Central Universities of China. Financial support by the Max Planck Partner Group Funding from the Max Planck Society, Germany, is greatly acknowledged.

语种：英文

外文关键词：Atmospheric pressure - Efficiency - Benzene - Phase equilibria - Solvent extraction - Ionic liquids

摘要：Separation of benzene and cyclohexane is one of the most important and difficult processes in the petrochemical industry, especially for low benzene concentration. In this work, three ionic liquids (ILs), [Bmimj[BF4], [Bpy][BF4], and [Bmim][SCN], were investigated as the solvent in the extraction of benzene from cyclohexane. The corresponding ternary liquid-liquid equilibria (LLE) were experimentally determined at T = 298.15 K and atmospheric pressure. The LLE data were correlated with the nonrandom two-liquid model, and the parameters were fitted. The separation capabilities of the ILs were evaluated in terms of the benzene distribution coefficient and solvent selectivity. The effect of the IL structure on the separation was explained based on a well-founded physical model, COSMO-RS. Finally, the extraction processes were defined, and the operation parameters were analyzed. It shows that the ILs studied are suitable solvents for the extractive separation of benzene and cyclohexane, and their separation efficiency can be generally ranked as [Bmim][BF4] > [Bpy][BF4] > [Bmim][SCN]. The extraction process for a feed with 15 mol % benzene was optimized. High product purity (cyclohexane 0.997) and high recovery efficiency (cyclohexane 96.9% and benzene 98.1%) can be reached.